feeble 無力的；虛弱的 The old woman is too feeble to do her own shopping. 老太太身體太虛弱了而不能獨(dú)立購物。 flap 拍打，拍打聲 Everything was working smoothly, there was no flap. 一切進(jìn)展順利，沒有出現(xiàn)問題。 flip 擲；輕擊 She flipped through the pages of a magazine, not really concentrating on them. 她翻閱著雜志，并沒有真的在看內(nèi)容。 fragile 脆的；易碎的 This old glass dish is very fragile. 這個(gè)舊的玻璃碟子非常易碎。 friction 摩擦力 Friction between two sticks can create a fire. 兩個(gè)棍棒相互摩擦能起火。 fuse 融合；熔化 Their common interests fuse the two companies. 處于共同利益，兩家公司合并了。 galaxy 銀河；星系 Astronomers at the University of California discovered one of the most distant galaxies. 加州大學(xué)的天文學(xué)家發(fā)現(xiàn)了最遙遠(yuǎn)的星系中的一個(gè)。 generalize 概括；推廣 You cannot generalize about the effects of the drug from one or two cases. 從一兩個(gè)案例中你難以概括出藥的療效。